Electromagnetic oscillator



July 7, 1931. M, P. MCCARTY 1,813,630

ELECTROMAGNETI 0 OS CILLATOR Filed July 25, 1929 2 Sheets-Sheet lINVENTOR 1 7 MAmSoNRM CARTY.

ATTORNEY July 7, 1931. v M. P. MCCARTY 1,813,630

ELECTROMAGNETIC OSCILLATOR Filed July 25, 1929 2 Sheets-Sheet 2 INVENTORMADISON P M CARTY.

. ATTORNEY Patented July 7, 1931 UNITED STATES PATENT OFFICE MADISON I.MCCARTY, OF DALLAS, TEXAS, ASSIGNOR OF FIFTY-ONE PER CENT TO WARNERCLARK, B. L. LAIRD, GRAHAM B. MOODY, LEONARD W. ORYNSKI, AND

EARL R. WALL, ALL OF DALLAS, TEXAS ELECTROMAGNETIC OSCILLATORApplication filed July 23,

This inve'n ion'relates to electrically operated devices and it hasparticular reference to an electrically'operated instrument,

' whose function is to provide a holder for instruments of a utilitariannature, such as safety razors, files, tooth brushes and the like and theprincipal object of the invention resides in a complete and novel holderof the character specified, which, by means of magnetic force, producesan ingenious and exceptionally useful device in which the severalinstruments named are interchangeable.

Still another object of the invention resides in its adaptability foruse as a tooth brush, safety hazor or similar, instruments, due to theprovision of means through which is eliminated the possibility ofsubjecting the user thereof to electrical shocks.

Still another object of the invention resides in the provision of adevice of the character specified, in which is embodied a newcombination of elements, producing a novel movement in a very compactarrangement for transmitting, preferably oscillating movement to thevarious instruments which may be designed to be attached to and operatedthereby.

With the foregoing objects as paramount, the invention has particularreference to its peculiar arrangement and operation of parts which willbecome manifest as the description proceeds, taken in connection withthe accompanying drawings, wherein Figure 1 is a view of the inventionattached to a conventional electrical wall fixture.

Figure 2 is an elevational View of the invention, showing an accessory,in the form of a tooth brush, applied thereto.

Figure 3 is a similar view of the invention,

with a safety razor as an accessory.

Figure 4 is a perspective view of the safety razor blade holder of thetype suitable for application to the invention.

Figure 5 is an axial section of one form of the invention.

Figure 6 is a detail view of the core and pole pieces of the oscillator.1

Figure 7 is a sectional View of the safety razor head, illustrating themanner in whic 1929. Serial No. 380,452.-

oscillatory movement is converted into reciprocative movement to movethe blade longitudinally in the head.

Figure 8 is an end illustration of the electro-magnet, pole piece andarmature.

Figure 9 is a View of a razor blade of the peculiar design adapted tothe present invention, showing its reciprocating device.

Figure 10 is a sectional View of the casing of the invention, showingthe specific manner in which an accessory is applied.

Figure 11 is an elevational view of an electro-magnet, forming part ofthe present invention and having a double windin Figure 12 is anenlarged view in ragmentary cross section of the securing means shown inFigure 10.

Figure 13 is a view in fragmentary crosssection of the casing, coilwinding spool in relationship therewith and further showing a bearingfor the core formed in said spool.

Figure 14 is an enlarged view in fragmentary section, showing the bladereciprocating mechanism, with the accessory in the form of a safetyrazor.

Figure 15 is a modified form of the armas ture and core.

Figure 16 is an end elevational view of the foim of the invention shownin Figure 15, an

Figure 17 is a side elevational View taken at a one-fourth angle onFigure 15 and fragmentarily showing its casing.

Continuing more in detail, it may be briefly stated. that the inventionembodies a combination of elements so arranged as to be cooperative intransmitting oscillatory movement to a shaft, which shaft projects fromthe oils-- ing to receive any character of instrument designed to beoperated by the invention. It is obvious that the movement is notvibratory but is perceptibly oscillatory and to such a degree that aninstrument applied thereto will have a definite movement, eitheroscillatory or reciprocative, depending upon the provision of meanswhereby to convert one movement to the other, but such means would notnecessarily be a part of the present invention although it is necessaryto complete the major purpose of the invention, that of imparting to a.safety razor blade the prerequisite shuttle or shuttle like movement orreciprocation.

Accordingly, 1 designates a suitable transformer of conventional typewhich is so designed that it may be threaded into any convenientalternating current outlet in the manner shown in Figure 1. The purposeof this transformer is to reduce the house current, which. is usually110 V. to a desirable low voltage of approximately 18 V. The pur pose ofthis is to obviate the possible attendant danger of a shock from the 110V. A. C. should a ground occur in the apparatus, thus rendering the sameentirely safe for the va' rious purposes for which it- -is designed.

Contained within'the casing 2, which is comprised preferably of moldedbakelite are the operative elements of the invention and to which leadsthe cord 3, containing the wires 4 and 5 and which latter are connectedto the windings of the core in the manner shown in Figures 5 and 15.

It will be particularly noted, especially in Figures 5 and 13 that thearmature 6 is stationary relative to the coil, or to the ends of thespool 7 upon which the wire constituting the coil is wound. The core ofthe coil is obviously hollow and passing therethrough is a shaft, whichwill be referred to later by an identifying reference character. Thisshaft is free to oscillate to a limited degree and affixed rigidlythereto'are L-shaped pole pieces 8 and 9, arranged in reversedrelationship. The longer port-ions of these pole pieces lie on the sameplane and parallel with the armature 6, which as stated previously isrigid with the spool or coil mounting. It

is therefore apparent that the pole pieces are capable of movementtoward and away from the armature and thus impart to the said shaft anoscillatory movement in the manner to be hereinafter more fullydescribed. Aflixed to the armature 6, at a point nearest its lower end,as shown in Figure 5 particularly, is a non-ferrous projection 10 and towhich projection is rigidly aflixed a spring 11, which latter islikewise on a plane parallel with the armature and has its other endfixed to the upper pole piece 9. The presence of the spring 11 in thecombination maintains a torsional balance and yieldingly holds themovable pole pieces 8 and 9 normally in inoperative positionpreparatoryto energization of the coil and consequent magnetization of the armature6 which attracts the said pole pieces at rapid recurring intervals.

The character 14 designates the core referred to in the foregoing whichlatter has a deep groove milled or cut therein to the approximatecenter, for the purpose of allowing the core to function as onelamination to prevent overheating. It is further pointed out that thepole pieces 8 and 9 are L-shaped so that the greater portions lie on aplane parallel with the armature 6 to obtain a more extensive pole faceor attraction area for the stationary armature 6. The attraction of thearmature 3 for the opposed pole pieces 8 and S) brings about movement ofthe shaft 16, pre viously referred to, in one direction while thetorsional action of the spring 11, upon the reversal of the alternatingcurrent returns the pole pieces 8 and 9 to their normally inoperativeposition to bring about the other movement of the said shaft 16 tocomplete one cycle in operation.

Vhen it is desired to employ as an accessory, such as a tooth brush,shown in Figures 1, 2 and 10 and designated at 17, the handle of thelatter is afiixed to the end of the shaft 16 in the manner shownpreferably in Figure 12, the latter Figure being an enlargement of thesame showing in Figure 10. A coupling 18 is secured to the operative endof the oscillating shaft 16 by means of a screw 19. A ferrule 20 iscapable of being received upon the coupling 18 and through the means ofa pin 21, rigid with the ferrule 20, the latter is constrained tooscillate with the shaft 16, while a yielding detent 22 enters a recessin the wall of the ferrule and locks the latter against accidentalrelease from the said coupling 18. A spring 23 allows the said pin 22 tobe depressed to permit the ferrule 20 to be applied to the coupling inthe manner shown in Figure 12.

As apparent also in this figure, as well as in Figures 1, 2 and 10, theend or handle of the brush 17 is rigidly held in the said ferrule 20.lVith further reference to Figure 12, it is pointed out that the spring23 bears against an enlargement 24 integral with the pin 22 and sincethe coupling is required to be cored to receive the enlargement 2t and105 the spring 23, a threaded plug 25 inserted into the core or openingto cover the same to prevent release of the said pin and springs 22 and23 respectively. Thus, should it be desired to replace these elements,it is re- 110 quired only to remove the plug 25 and replace the sameafter the moving elements are replaced.

It may be mentioned at this point that accessories other than the brush17 may be 115 applied to be similarly operated by the invention andthese accessories may include massaging devices, safety razors or likeaccessories.

W'ith reference to the safety razor, the 190 same oscillating mechanismis employed, although in order to operate the razor or specifically theblade of the razor, the means by which the razor head is attached mustvary considerably from the coupling employed for operatively attachingthe brush l7 and other accessories which require oscillatory rather thanreciprocative motion.

The mode of applying the razor is illustrated in Figures 3 to 9inclusive and in Fig- 150 are 14. In this latter Figure, it is notedthat the coupling 18 has a transverse slot or groove 26-. in its headand in which is received .the flattened end of a short shaft or pin 27Extending outwardly from the upper end of the shaft 27 is a relativelysmall pin 28 and is integral with the said shaft 27.

Obviously, when the axial shaft 16 of the invention is oscillated in themanner explained briefly in the foregoing, the shaft 27 is alsooscillated, thus causing the short pin 28 to oscillate to a limitedextent.

Referring now to the blade 29, it is pointed out in Figure 9 that theblade has a central opening or aperture, which aperture has a smallcut-out in one side and it is into this cut-out that the pin 28projects. The razor head is composed of two elements 30 and 31, theopenings 32 on either side of the central opening in the blade 29 beingreceived by the guide pins 33 carried by the element 30 of'the razorhead. Thus when the three elements are assembled, that is to say, theelements 30 and 31 of the head and the interposed blade 29 in the mannershown in Figure 5, oscillating movement imparted to the transverselyextending pin 28, in the manner hereinbefore mentioned, the blade 29will be caused to move endwise in two directions, by reason of the factthat the end of the said pin 28 engages the cut-out in the blade 29 asshown in F igure 9, the said pins .33 of the head portion 30 acting asguides to revent any lateral displacement of the sai blade 29.

The foregoing explanation is believed sufficient to clearly define theoperation of the head and the manner of transmitting operating movementfrom the instrument. The several minor elements making up the assemblyby which the razor head and its associated elements, is appliedoperatively to the instruments will be described in greater detail laterin the description.

In Figure 8, it ispointed out that the spool 7 of the electro-magnet isheld in position in the casing 2 by means of screws 34 which latterenter threaded openings in the ends of the spool. It has been statedpreviously that the core 14 is in fact the same element as the shaft 16and may be mentioned as being a movable core, since it has been clearlyset forth that the shaft 16 operates and the eletnent 14 and 16 beingone and the same thing, it forms a supporting means for the pole pieces8 and 9, which are rigidly secured thereto. Figure 13 very definitelyshows this assembly, it being pointed out that the hollow spool 7affords a bearing for the core or shaft bearing the two referencecharacters 14 and 16.

Convent onal winding is provided on the spool 7 and double winding ispreferred, the two windings 35 and 36 being connected in series. InFigure ,11, the wire 37 of the winding 35 is connected to the wire 38 ofthe winding 36, through which medium the series connection is completed.

Referring again to the specific details by which the razor head, shownin Figure 14 especially, is connected to the instrument, it is pointedout that a supplementary housing 40 in the form of a ferrule has aprojecting pin 41 adjacent its lower end which is received in a recess42 in the top of the casing 2. The said supplementary hOUSiIlg 40 beingthus restrained against rotation with respect to the casing 2 and isfrictionally prevented from being accidentally released from the casing.The housing or ferrule 40 has an interiorly threaded upper end whichreceives the threaded pin 43, integral with the portion 30, forming apart of the head as shown in Figure 14.

It is within this pin 43 that the short shaft 27, referred topreviously, is arranged to oscillate and affords a bearing for the saidshaft 27. It is believed to be apparent from the showing in Figure 14that although the companion element 31 of the razor head and the blade29 is not shown in this Figure, how the said blade 29 is reciprocated,especially when Figure 14 is compared to Figure 7 showing the headstructure complete. It is understood that the coupling 18 is the same inFigure 14 as in Figures 10 and 12, described in the first part of thespecifications. In operation, when the cord 3 is attached in theconventional manner to the usual 110 V. current, the electro-magneticcoil is instantly energized, magnetizing the armature 6 which attractsthe opposing pole pieces 8 and 9, near the said armature 6 at either endof the coil. The interruptions in the A. C. will permit the spring 11 toreturn the pole pieces 8 and 9 to their normal inoperative position, asshown in Figure 5, to be again attracted by the magnet. This operationcontinues at rapid recurring intervals until the instrument isdisconnected. It is clearly obvious that each time the pole pieces 8 and9 move toward and away from the armature 6, the core or shaft 16 isoscillated and in the case of the brush 17 as an accessory, the samemovement is imparted to the brush as is imparted to the said core orshaft 16. However, in the case of the razor blade 29, the oscillatingmovement is converted into reciprocating movement in the manner ashereinbefore fully explained.

Figures 15, 16 and 17 illustrate the variations in the oscillatinginstrument described in the foregoing.

In these variations, the principle is substantially the same as in thestructure just described, although the armature is movable relative tothe pole pieces. which latter are stationary w th the coil, it beingrecalled that in the former case the pole pieces were movable and thearmature stationary with the coil. The same results are obtainable andthe structure has been found to be equally as efiicient as thatdescribed in the foregoing. In Figure 17, 44 designates the core, Whilethe armature is identified by the character 45, which has its ends bentat right angles toward the axis of the core and rigidly affixed to theshaft 16. Thus when the armature moves, the shaft 16 is oscillated tothe extent of movement of the armature 6. The pole pieces 46 arelaminated and held stationary relative to the casing 2 by screws 34. Inthe present structure however, the shaft 16 does not extend entirelythrough the core but is provided with pivots 51 which permits of pivotaldisplacement of the armature 45 relative to the said pole pieces 46, itbeing pointed out that the means by which the pole pieces 46 aresupported is non-ferrous, as are the pivots 51. The spring whichprovides for the yielding movement between the armature and the polepieces bears the same character of reference 11, as in the previousstructure, since its function is identical. A lug 47 is affixed rigidlyto the armature 45, which slidingly receives one end of the spring 11,while the other end of the spring is rigidly affixed to a lug 48,integral with or affixed to a brace bar 49, maintaining stationaryposition of the opposed pole pieces 46.

When the magnet is energized, the armature 45 will be attracted to thepole pieces 46. At the reversal of the A. 0., the energization of themagnet will take place and the spring 11 will return the armature to itsnormal inoperative position, the result being the same as in thepreviously described structure.

Manifestly, the construction shown is ca pable of considerablemodification and such modification as is considered within the scope andmeaning of the appended claims is also considered within the spirit andintent of the invention.

What I claim is:

1. A device for electrically imparting os cillatory movement in theoperation of instruments including an electro-magnetic coil, an axiallydisposed element arranged to operatively receive said instruments andcapable of movement relative to said coil, an armature arranged inparallel relationship with the axis of said coil, pole pieces affixed tosaid element having their greatest area in parallel relationship withand exposed to said armature and arranged to be movable relative to saidarmature to operate said axially" disposed element through the magneticeffect produced by said coil on said armature.

2. A device for electrically imparting oscillatory movement in theoperation of interiorly of said coil, an armature arranged in parallelrelationship with respect to the axis of said member and arranged toattract said pole pieces when'said coil'is energized and means fortorsionally returning said movable member to normal position.

3. A device for electrically imparting 0scillatory movement for theoperation of instruments including an electro-magnetic coil, a coremember arranged for oscillation and disposed in parallel relationshipwith respect to the axis of said coil, means connected to said'coremember, and extending alongside said coil for transmitting oscillatorymovement to said core member, means affording magnetic attraction tomove said latter means upon energization of said coil and means fortorsionally returning said core member to normal position.

4. An electro-magnetic oscillating device including coils arranged inend to end relationship and connected in series, a movable core member,means for imparting oscillatory movement to said core member, said meansincluding substantially L-shaped pole pieces in fixed relationship withsaid core member, an armature in fixed relationship with said coils andin parallel relationship with said pole pieces, intermediate means forholding said pole pieces and armature apart preparatory to encrgizationof said coils when said pole pieces will be attracted by said armatureto oscillate said core member.

5. An electro-magnetic oscillator including paired coils connected inseries and having a continuous tool receiving core member arranged foroscillatory movement, an armature rigid with said coils, pole piecesaflixed to either end of said core member and extending in oppositedirections in parallel relationship with said coils and capable of beingat-. tracted by the magnetic effect of said armature to move said coremember and means flexibly connecting said pole pieces and said armatureto return said pole pieces and core member to normal position.

In testimony whereof I set my hand this 20th day of July, 1929.

MADISON P. MGCARTY.

struments including an electro-magnetic coil,

a movable member for operatively receiving said instruments, pole piecesaflixed to said member and extending in either direction ex-

